| master | (verb) have a firm understanding or knowledge of; be on top of | Synonyms: control |
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| (verb) be or become completely proficient or skilled in | Synonyms: get the hang |
| (verb) get on top of; deal with successfully | Synonyms: get over, overcome, subdue, surmount |
| (verb) have dominance or the power to defeat over | Synonyms: dominate |
| mastermind | (verb) plan and direct (a complex undertaking) | Synonyms: direct, engineer, orchestrate, organise, organize |
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| masticate | (verb) chew (food); to bite and grind with the teeth | Synonyms: chew, jaw, manducate |
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| (verb) grind and knead | - |
| masturbate | (verb) get sexual gratification through self-stimulation | Synonyms: fuck off, jack off, jerk off, she-bop, wank |
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| (verb) stimulate sexually | - |