(informal) God forbid!

to be something to which one wouldn't say no, to be something that one wouldn't mind, to be most welcome

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

(transitive) not to let out of one's sight, not to take one's eyes off, to keep an eye on

(vulgar) to do fuck all, not to do a damn thing, to do nothing

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

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!

to laze around