Look at the highlighted expressions in the following sentences from the text and explain their figurative meaning.

• 'I went through it, sir, with a fine-toothed comb and never a Garrideb could I catch.'

• 'They are my favourite covert for putting up a bird, and I would never have overlooked a cock pheasant as that.'

• 'There is no bolt-hole for you in this country.'

• 'When his castle in the air fell down, it burred him beneath the ruins.'