Final answer:
The meter of the line is iambic tetrameter.
Step-by-step explanation:
The meter of the line 'Wild men who caught and sang the sun in flight' from the poem 'Do not go gentle into that good night' is iambic tetrameter. In iambic tetrameter, there are four metrical feet, or iambs, in each line. An iamb consists of an unstressed syllable followed by a stressed syllable. In this line, there are four iambs: 'Wild men,' 'who caught,' 'and sang,' 'the sun.'
Learn more about Meter in poetry