1) Affects unfavorably 2) Aftershocks 3) Amphorae 4) Array in the pickle aisle 5) Baby food array 6) Baby food buys 7) Baby food servings 8) Ball products 9) Bumps 10) Bumps into 11) Button holders of a sort 12) Cannery row 13) Canning containers 14) Canning equipment 15) Canning needs 16) Certain containers 1) Canisters 
Down hole tools inserted in the drill-string when fishing to jerk or jar the fish (object in well) free by repeated sudden blows. They may also be used while drilling to avoid the drill-string becoming stuck. (see fishing)
In Ireland Jars is often used to refer to alcoholic drinks, i.e. Are you going for a few Jars?