mole cricket
螻 refers specifically to the mole cricket, a burrowing insect. The meaning is narrow and does not extend to other concepts.
螻 combines 虫 (insect) with 婁, which likely provides the sound. The character was created to name the mole cricket specifically.
The insect radical 虫 on the left signals a bug, and the right side 婁 suggests a burrowing shape. Picture a mole cricket digging through the earth like a tiny underground creature.
For ロウ, imagine a mole cricket crawling low to the ground: low -> ロウ, and the insect stays hidden in its burrow.
mole cricket (esp. the Oriental mole cricket, Gryllotalpa orientalis)
stonefly (any insect of order Plecoptera, esp. those of family Perlidae)
edge of a gabled roof; verge
being a jack of all trades and master of none
being a jack of all trades and master of none
caddisfly; caddis fly (any moth-like insect of the order Trichoptera)