What does Etymonline mean by 'to raise (someone) out of trouble'?
I have never heard of "to raise (someone) out of trouble"! What does this mean?
relieve (v.) [on Etymonline]
late 14c., releven, "alleviate (pain, etc.) wholly or partly, mitigate; afford comfort; allow respite; diminish the pressure of," also "give alms to, provide for;" also figuratively, "take heart, cheer up;"
from Old French relever "to raise, relieve" (11c.)
and directly from Latin relevare "to raise, alleviate, lift up, free from a burden,"
from re-, here perhaps an intensive prefix (see re-),
+ levare "to lift up, lighten," from levis "not heavy" (from PIE root *legwh- "not heavy, having little weight").
The notion is "to raise (someone) out of trouble." [my emboldening] From c. 1400 as "advance to the rescue in battle, bring help to a besieged place;" also "return from battle; recall (troops)." Meaning "release from duty" is from early 15c. Related: relieved; relieving.
I can surmise merely one meaning — medical professionals lifting or raising a patient. But I have no clue if medical professionals — if they existed in the 14th century — raised patients like in the pictures below!