Around 4 months of age, your Lab puppy will begin replacing the milk teeth with adult teeth. At 6 to 7 months, the full set of 42 permanent teeth will be in.
(plural strike rates) ( 1 baseball) the number of runs of a batter divided by the number of balls faced. ( 2 cricket) the number of runs scored by a batsman per 100 balls faced; the number of balls bowled by a bowler divided by the number of wickets taken.  Link/Cite.
Related to strike up: strike up a conversation. (strÄ«k) v. struck (strÅ­k), struck or strickÂ·en (strÄ­kâ²Én), strikÂ·ing, strikes. v.tr. 1. a. To hit sharply, as with a hand, fist, weapon, or implement: struck the table in anger; strikes the ball with a nine iron; struck the nail with a hammer.