simple past tense and past participle of back up

Third-person singular simple present indicative form of bring back

present participle of back up

Third-person singular simple present indicative form of back up

Third-person singular simple present indicative form of go back

simple past tense of go back

past participle of go back

present participle of go back

(electronics, of a device) Using a battery to maintain operation when not powered by the main electrical supply (e.g. during a blackout).

Having a broken back. / (nautical, of a ship) Drooping at each end because of a damaged spine. / Decrepit, weakened.