All 4 Uses

yield
in
Doctor Zhivago
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They were headed by Generals Vitsyn, Quadri, and Bas-salygo, who were known far and wide for their harshness and unyielding resolution, and whose names alone terrified the refugees inside the camp as well as the peaceful population remaining in its native villages at the rear of the encircling troops.†
Chpt 2.12

unyielding = strict, firm, or hard (not giving in, not giving way, or not giving up)

standard prefix: The prefix "un-" in unyielding means not and reverses the meaning of yielding. This is the same pattern you see in words like unhappy, unknown, and unlucky.
As a result, his feeling, still pulsing and warm, was gradually eliminated from his poems, and romantic morbidity yielded to a broad and serene vision that lifted the particular to the level of the universal and familiar.
Chpt 2.14 *

yielded = gave in, gave way, or gave up
Leaning against an upright at the entrance, I strain to make the far-off echo yield A cue to the events that may come in my day.
Chpt 2.17 *

yield = produce or give
Two birches
Guarding the portals have to step aside
And yield the right of way.†
Chpt 2.17

Definitions:

(1) (yield as in: will yield valuable data)
to produce (usually something wanted); or the thing or amount produced
(2) (yield as in: yield to pressure)
to give in, give way, or give up
(3) (meaning too rare to warrant focus)