spend money like water [like there's no tomorrow]
金を湯水のように使う
spend more time with one's family
家族との時間を増やす
spend much effort (in [on]) doing
…することに努力する
spend one's vacation at [by] the sea
休暇を海辺で過ごす
spend public money (on) promoting public transport
公的資金を公共交通の促進につぎ込む
spend public money on health
医療に公的資金を使う
spend some thought on how to do it
それをどうやろうかと思いめぐらす
spend the money away
金を使い続ける
spend the night at ...
…に泊まる
spend the night together [with ...]
一夜[…と一夜]を共にする