быть на взводе {v.phr.}
{informal} to psych (up/out), {slang} to screw.
~ be blue in the face
To be highly emotional or nervous; be prepared to smt., or to action; be bery angry or disappointed.
на взводе {adj.phr.}
high(ly)-strung, nervous, wrought-up; strung-up {Brit.}.
{literally} having one's gun cocked (?).
Игорь предчувствовал серьезный разговор с посетителем и был заранее на взводе. — Igor expected high words with the visitor and was nervous beforehand.