Pliantly; yielding — a mimetic word for bending or moving flexibly, or appearing compliant.
彼は上司に会うとヘコヘコと頭を下げる癖がある。
He has a habit of bowing obsequiously to his boss.
古い机の天板が踏むとヘコヘコする。
The top of the old desk gives way a bit when stepped on.
子犬がヘコヘコとお腹を見せて甘えている。
The puppy is showing its belly and being submissive.
Subserviently; ingratiatingly — describing a servile or fawning attitude toward someone.
部長の前で彼はヘコヘコして意見を言わない。
He fawns over the manager and doesn't voice his opinions.
ヘコヘコした態度は信頼を失うことがあるから注意した方がいい。
A servile attitude can make you lose trust, so it's better to be careful.
あの係長は客にヘコヘコしているが、裏では厳しい。
That section chief is obsequious to customers but strict behind their backs.