This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 厇 is uncertain. It combines 厂 (cliff) with 乇, but the original function and meaning are unclear.
Since the meaning is uncertain, focus on the shape: a cliff 厂 with a distinctive inner part 乇. Remember it as an uncommon kanji with no clear standalone meaning.
For タク, imagine a tack stuck under a cliff: tack -> タク, and the tack is wedged inside the 厂 enclosure.