на взводе

 {informal} to psych (up/out),  {slang} to screw.
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.
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