present participle of push back

long ago / far into the past

(linear algebra) A method of solving linear systems that have been transformed into row echelon form. / (combinatorics) A method of solving recurrence relations.

Alternative spelling of backbone

plural of back-bone

present participle of back out

(intransitive) To retaliate. / (transitive) To repress (an emotion).

Alternative form of yellowback

plural of yellow back

plural of yellow-back