To squirt or spray liquid forcefully onto or over something.
From 'be-' (prefix intensifying the action) + 'squirt' (to eject liquid in a thin stream). The prefix adds thoroughness or violence to the squirting action.
Like many 'be-' verbs, 'besquirt' is theoretically constructable from regular English roots, which is why it appears in older texts, but it's so informal-sounding that modern writers avoid it in favor of plain 'squirt.'
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