(electronics) Initialism of uninterruptible power supply/source / Initialism of ultraviolet photoelectron spectroscopy. / (biochemistry) Initialism of ubiquitin-proteasome system.

(electronics, nonstandard) To connect a device to an uninterruptible power supply

Initialism of United Parcel Service.

plural of up

Third-person singular simple present indicative form of up

Misspelling of oops.

plural of UP

(informal) Legitimate; honest; upright.

Alternative spelling of on the up-and-up

plural of big up