tap / space
Classic usage
Reading level: hard
Estimated CEFR level: B1 — Intermediate
Estimated from word frequency; not an official CEFR classification.
From Middle English susteinen, sustenen, from Old French sustenir (French soutenir), from Latin sustineō, sustinēre (“to uphold”), from sub- (“from below, up”) + teneō (“hold”, verb).
prolong, keep up
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tap / space
Classic usage
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