on the trail/track of (someone or something)

Другие идиомы:

• one's bark is worse than one's bite
• on horseback
• one's tail between one's legs
• one's goose is cooked
• one's flesh and blood
• off one's back
• off one's chest
• on (someone's) back
• on (someone's) shoulders
• out for blood
• out of breath
• on credit
• on hand
• on the block
• out-of-pocket expenses