czas.

bring up to date (что-либо); cultivate; heighten; effect improvements in (smth., что-л.); brush on; brush up; brush upon; update; accomplish; improve upon; refine on; refine upon; improve on; amend (Aly19); add a new dimension to (askandy); up-date; fine-tune (princess Tatiana); alter; refine (что-либо); improve; introduce refinements (Wakeful dormouse); tweak (to change something slightly to try to improve it Taras); upcycle (Shawty); streamline (*обычно работу – make (an organization or system) more efficient and effective by employing faster or simpler working methods (Oxford Dictionary) • As part of our commitment to streamlining operations and enhancing efficiency, our company now offers invoicing on a monthly or annual basis for all new clients. ART Vancouver)

austral., slang

nicky up

bibliot.

advance (знания)

dypl.

keep up to date (что-либо)

eduk.

upskill (Sergei Aprelikov)

improve (upon)

make a difference (with ... – ... что-л.

army.mil Alex_Odeychuk)

kino.

upgrade (He's upgrading the room's archaic sound system)

makar.

bring up to date (модернизировать); elaborate; update (модернизировать); bring something up to date (что-либо); polish up; refine on (что-либо); refine upon (что-либо)

mat.

refine; develop

organ.

debottleneck (производство, линию, машину igisheva)

unpimp (bjay)

style; upgrade; perfect; update

wojsk.

upgrade (применительно к технике и вооружению алешаBG); make perfect (источник – Russian special forces functional program. Immediate action drills; ссылка –

yojik.eu dimock)

żarg.

beef up (MichaelBurov)

усовершенствоваться czas.

Gruzovik

perfect oneself in (pf of совершенствоваться)

posp.

enjoy

daw.

become better (in); perfect oneself (in)

Gruzovik, daw.

become better in