Dictionary Definition:
ud-√yam P. -yacchati (aor. -ayān RV. vi, 71, 5), Ā. (if the result of the action returns to the agent Pāṇ. 1-3, 75) -yacchate (aor. -ayaṃsta and -yamiṣṭa)
• Subj. -yaṃsate RV. i, 143, 7
• inf. -yámam MaitrS. ii, 4, 3) to lift up, raise RV. v, 32, 7 ; vi, 71, 1 & 5 AV. AitBr. ŚBr. Lāṭy. Śak. &c
• to raise, set up, elevate
• to put up or higher, carry or bring upwards RV. iv, 53, 1 ; i, 143, 7 TS. ŚBr. KātyŚr. &c
• to hold out, present, offer (a sacrifice to gods, or any other thing to men) RV. AV. TS. MBh. BhP. R. &c
• to shake up, rouse RV. i, 10, 1 ; i, 56, 1 ; x, 119, 2 AV. xiv, 1, 59
• to raise (one's voice, or rays, or light) RV
• to undertake, commence
• to be diligent, strive after (only P., e.g. udyacchati cikitsāṃ vaidyaḥ, 'the physician strives after the science of medicine' Kāś. on Pāṇ. 1-3, 75
• with dat. or acc. or without any object) MBh. Hariv. Ragh. Kathās. Rājat. &c
• to rein, curb
• to guide MBh
• to keep away or off, restrain, check TS. vi, 3, 4, 6 TBr. iii, 3, 1, 3: Intens. -yamyamīti, to raise, stretch out (the arms) RV. i, 95, 7