جسر1 جَسَرَ, (K,) aor. ـُ (TA,) inf. n. جَسَارَةٌ (A, K, KL) and جُسُورٌ, said of a man, (K,) He was daring, courageous, or bold: (A, KL:) he acted with penetrating energy, or sharpness, vigorousness, and effectiveness; syn. مَضَى and نَفَذَ. (K.) You say, جَسَرَ عَلَى كَذَا, aor. ـُ inf. n. جَسَارَةٌ, He ventured upon such a thing daringly, courageously, or boldly; (S, A;) as also ↓ تجاسر: (S:) and عَلَيْهِ ↓ تجاسر he emboldened himself against it, or him. (A, K.) And جَسَرَ عَلَى عَدُوِّهِ, (A, Msb,) aor. ـُ inf. n. جُسُورٌ and جَسَارَةٌ, (Msb,) He acted daringly, conrageously, or boldly, against his enemy. (A.) And لَا يَجْسُرُ أَنْ يَفْعَلَ كَذَا He dares not to do such a thing. (A.) A2:  جَسَرَ, (K,) inf. n.  جَسْرٌ, (TA,) He (a man) arched, or vaulted, a جِسْر [or bridge]. (K.) b2:  It is said of [the giant] 'Ooj (عُوج), in a trad., وَقَعَ عَلَى نِيلِ مِصْرَ فَجَسَرَهُمْ سَنَةً, i. e., (tropical:)  [He fell down upon the Nile of Egypt, and] became a bridge to them [for the space of a year]. (A.) b3:  And one says, جَسَرَتِ الرِّكَابُ المَفَازَةَ, and ↓ اِجْتَسَرَتْهَا, (tropical:)  The travellingcamels crossed, or passed over, the desert, (A, K,) as by a bridge: (A:) and السَّفِينَةُ البَحْرَ ↓ اجتسرتِ (tropical:)  The ship crossed, or passed over, the sea: (A:) or rode upon, and passed through, the sea. (K.) 2 جسّرهُ, (A, K,) inf. n. تَجْسِيرٌ; (K;) [and ↓ اجسرهُ; (see أَغَرَّهُ;)] He encouraged him; emboldened him. (A, K.) 4 أَجْسَرَ see 2.6 تجاسر: see 1, in two places. b2:  Also He stretched himself up, and raised his head. (K.) b3:  تجاسر لَهُ بِالعَصَا He put himself in motion to him (En-Nawádir, K) with the staff, or stick. (K.) b4:  تجاسروا They acted with mutual daring or courage or boldness. (KL.) b5:  They journeyed [app. with boldness, or emulating one another in boldness]. (TA.) b6:  الخَيْلُ تَجَاسَرُ بِالكُمَاةِ [for تَتَجَاسَرُ] (tropical:)  The horses convey the brave armed men away, or along, or across. (A.) 8 إِجْتَسَرَ see 1, last sentence, in two places.جَسْرٌ: see جَسُورٌ, in two places. b2:  Also, applied to a he-camel, Sharp, spirited, or vigorous; syn. مَاضٍ [as contr. of بَلِيدٌ]; as also جَسْرَةٌ and ↓ مُتَجَاسِرَةٌ applied to a she-camel: or (so in the K accord. to the TA; but in the CK, “and ”) tall: (K:) or tall and bulky: and with ة, applied to a she-camel, it has this last signification; (TA;) or signifies strong, and bold to endure travel: (A, TA:) the masc. epithet applied to a he-camel is rare. (Lth, TA.) b3:  Also Large, or bulky; applied to a camel, (S, K,) &c., (S,) or to anything, (K,) or to any limb, or member: (TA:) fem. with ة. (S, K.) b4:  جَسْرَةُ السَّوَاعِدِ, and المُخَدَّمِ, Full or plump [in the fore arms, and in the place of the anklet]; applied to a girl, or young woman. (A, TA.) A2:  See also what next follows.جِسْرٌ and ↓ جَسْرٌ [A bridge; and a dyke, or causeway:] that on which one crosses over a river or the like; (S, Mgh, Msb, K;) as a قَنْطَرَة and the like; (TA;) whether built or not built: (Mgh, Msb:) and a bridge of boats; boats bound together, and tied to stakes in the bank, being over a river; see قَنْطَرَةٌ: (TA:) pl. (of pauc., TA) أَجْسُرٌ (K) and (of mult., TA) جُسُورٌ. (S, Msb, K.) [Hence,] المَوْتُ جِسْرٌ يُوَصِّلُ الحَبِيبَإِلَى الحَبِيبِ (tropical:)  [Death is a bridge that conveys the friend to the friend]. (TA.) And جَعَلَ طَاعَتَهُ جِسْرًا إِلَى نَجَاتِهِ (tropical:)  [He made his obedience a bridge to his safety]. (A, TA.) جَسُورٌ Daring, courageous, or bold: (S, A:) or courageous and tall; as also ↓ جَسْرٌ: (K:) or courageous; and also tall and bulky; applied to a man; and so ↓ جَسْرٌ: (TA:) fem. of the former without, and sometimes with, ة: (Msb:) and of the latter with ة: (TA:) pl. of the former جُسُرٌ and جُسْرٌ. (K, TA.) It is not applied to a hecamel; but with ة is applied to a she-camel, meaning Bold to traverse rugged, or difficult, tracts. (Msb.) جَسَّارٌ Very daring or courageous or bold. (TA.) مُتَجَاسِرَةٌ: see جَسْرٌ.