высасывать из пальца
высасывать из пальца {v. phr.}
{literally}
To suck something out of one's finger.
~ to make (d) up out of whole cloth.
To fabricate smth, dream the whole thing up.
To allege something which has no foundation in actual fact, absolutely groundless; to fabricate.
Comp.:
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Source: Using "A book of Russian idioms illustrated" by M. Dubrovin, illustrated by V.Tilman