捻蚂蚁

Traditional (Taiwan): 捻螞蟻

niǎnmǎyǐ ㄋㄧㄢˇ ㄇㄚˇ ㄧˇ

    • something very easy to deal with
    • easily beaten opponent

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
pinch an ant
Meaning
Something very easy to deal with, or an opponent who is easily beaten. Similar to 'a piece of cake'.

Sources