hard-and-fast rule

Другие идиомы:

• hard nut to crack
• as hard as nails
• hard up
• to be hard on (someone's) heels
• hard on (someone or something)
• hard feelings
• hard of hearing
• hard to call
• hard-nosed
• hard-pressed
• hit (someone) hard
• hard sell
• hard on (someone's) heels
• hard to stomach (someone or something)
• hair of the dog that bit one