养路费

• 羊(goat; sheep)ASSOCIATIVE
• 儿(person; variant form)RADICAL

A person nourishing a lamb is the meaning of the character.

• 足(foot; step)RADICAL
• 各(each place; go to another place)PHONO-SEMANTIC

A road is where two feet step to reach everywhere.

• 弗(not; no)PHONETIC
• 貝(shell; currency)RADICAL

Expense is money that you can never keep in your hand no matter how hard you try.