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slam 酷評する

Japan came under international pressure last year to combat human-trafficking after the U.S. State Department issued a report in June slamming Japan's efforts to crack down on the problem.

pay off 〈借金などを〉清算する, 皆済する

In one case, a Thai teen was forced into the sex trade to pay off her 5 million yen debt.

ground 　　外出禁止にする、自宅謹慎にする
reprimand 懲戒

the ministry grounded the JAL pilot involved in the Hokkaido airport case for 30 days and reprimanded the copilot.

follow up 〔…を〕どこまでも追求する 〔on〕
follow up on a lead （犯罪の）手がかりを徹底的に追求する.

The unusual move is designed to ensure that JAL follows up on the safety procedures it promised earlier in the day to carry out.

subject 受けさせる、

The transport ministry said Thursday it will subject the Japan Airlines Group to special safety inspections through the end of the year, following a spate of safety-related problems involving the nation's largest carrier.

leave it up to に任せる

leave it up to one's judgment 〜の判断に任せる

Properly speaking, JAL is a big boy and should implement the measures by itself," but given the current situation, the ministry cannot leave it up to the carrier, Satoshi Iwamura, vice transport minister, told a news conference.