つけで買ってはいけません。

bill; bill of sale; payment invoice; tab (for later payment); credit; contact move (in go); direct attack to an enemy stone; sound effect produced by striking with clappers a wooden board in kabuki; letter; reason; motive; pretext; one's fortune; one's luck

indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.

to buy; to purchase; to value; to have a high opinion; to stir; to provoke

if ... then; when; and; why don't you...?; the more (one does something); because; since