undertide

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From Old English underntid, equivalent to undern + tide.

• underntide

undertide (plural undertides)

1. (obsolete) Synonym of undern: originally terce and the morning, later (UK dialect obsolete) noon and the early afternoon.

• (terce): 9 a.m.
• (morning): morn, matin; see also Thesaurus:morning
• (noon): meridian, sext; see also Thesaurus:midday
• (early afternoon): arvo; see also Thesaurus:afternoon

From under- +‎ tide.

undertide (plural undertides)

1. Synonym of undercurrent.

• "undern-tide, n.", and "undertide, n.", in the Oxford English Dictionary, Oxford: Oxford University Press.

• nerditude