(games, idiomatic) that's not fair game

(slang) no glove, no love

(informal) not bad to look at, quite good-looking

to be no sucker, to not be easily taken in, to not let oneself be fooled easily

a leopard cannot change its spots

to be just as good as someone, not to compare unfavourably to someone; not to be lagging behind

(informal) and that's not the half of it!

not to be worth a thing, not to be worth a penny, to be worthless

(figuratively) to take everything in, to drink it all in, not to miss a word, not to miss a thing

(figuratively) for there to be no doubt about it, to be a certainty, to be clear