clap on

clap on (third-person singular simple present claps on, present participle clapping on, simple past and past participle clapped on)

1. (nautical, transitive) to temporarily add something to an existing part, especially to add an additional sail to take advantage of a fair wind
2. (dated, slang, US, 19th century) To decide to make a concerted effort to do something; to operate with dedication and vigor.

• Coplan