noun, verb ·Rare ·Advanced level

Definitions

Noun

1. 1
   Material added at the side or in the margin, as in a book. countable, uncountable
2. 2
   The act of pushing something aside; marginalization. countable, figuratively, uncountable

Verb

1. 1
   present participle and gerund of sideline form-of, gerund, participle, present

Synonyms

All synonyms

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.