Ok, to limit crowding on the BBs, I have decided to keep only 5 idioms o' the day active at one time. Like God, I shall rest on Sunday. Like a man w/ a hangover, I shall rest on Saturday. After the weekend, I will re-name the oldest Idiom o' the day appropriately (Ie, next week, idiom o' the day #1 will be replaced w/ idiom o' the day #6.)

He has a screw loose:
1.)он не в своём уме 2.) у него винтика в голове не хватает.

Он - p.pn.he
Не- negative paticle.(negates verb или clause.)
свой - p.pn. One's own (not to be confused with себя)
ум - n. Masc. mind
ум + предложный падеж - уме => in mind
У него - he has (lit. at him is)
Винтик - n.Masc. - a screw
В + предложный падеж => in
Голова - n. Fem. = Head (part of body)
Masc. = Head (Lead person, person in charge of...)
Хватать/Хватить - v. to suffice, to have enough, to grasp.[/i]