intransitive. To engage in birdwatching; to be a birdwatcher.

intransitive. To engage in birdwatching; = birdwatch, v.

(a) intransitive = trainspot, v.; (b) transitive to watch for and note the details of (a locomotive); (now somewhat dated).

intransitive. To engage in trainspotting; to be a trainspotter.

colloquial (originally British). intransitive. To attempt to make sightings of rare birds, esp. obsessively or by travelling great distances. Cf. twi…