支う is read as かう (kau) and means to support.
かう
kau
しはらう
to pay
ささえあう
to support each other
しじ
propping up
ししゅつ
expenditure
しきょく
branch office
してん
しはい
government
ししゃ
したく
preparation
しはらい
payment
しはらいほうほう
payment method
しぶ
branch