tinder

Short definition from Wiktionary

Noun

1. 1
   Small dry sticks and finely-divided fibrous matter etc., used to help light a fire.

Verb

1. 1
   To set fire to; torch.
2. 2
   To use the dating application Tinder.

Proper noun

1. 1
   A surname.
2. 2
   An online dating and geosocial networking application, launched in 2012, in which users "swipe right" to like or "swipe left" to dislike other users' profiles.