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solidarity /ˌsɒlɪˈdarɪti/
noun
unity or agreement of feeling or action, especially among individuals with a common interest; mutual support within a group:
factory workers voiced solidarity with the striking students.

solidarity /ˌsɒlɪˈdarɪti/
noun
our solidarity is what gives us the credibility and power to make changes: UNANIMITY, unity, like-mindedness, agreement, accord, harmony, consensus, concurrence, cooperation, cohesion, fraternity, mutual support; formal concord.

ORIGIN
mid 19th century: from French
solidarité, from solidairesolidary.’

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feign /feɪn/
verb [with object]
pretend to be affected by (a feeling, state, or injury):
she feigned nervousness.
archaic invent (a story or excuse).
• [no object]
archaic indulge in pretense.

feign /feɪn/
verb
1
she lay still and feigned sleep: SIMULATE, fake, sham, affect, give the appearance of, make a pretense of.
2
he's not really ill, he's only feigning: PRETEND, put it on, fake, sham, bluff, masquerade, play-act; informal kid.

ORIGIN
Middle English: from Old French
feign-, stem of feindre, from Latin fingere ‘mold, contrive.’ Senses in Middle English (taken from Latin) included ‘make something,’ ‘invent a story, excuse, or allegation,’ hence ‘make a pretense of a feeling or response’ Compare with fiction and figment.