mole cricket
螻 refers specifically to the mole cricket, a burrowing insect. The meaning is narrow and does not extend to other concepts.
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)
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.