Function: intransitive verb
Date: 1850
1 a : to come to the expected total <the bill doesn't add up > b : to form an intelligible pattern : make sense <her story just doesn't add up >
2 a : AMOUNT 1B ― used with to <the play adds up to a lot of laughs> b : to amount to a lot <just a little each time, but it all adds up >
transitive verb : to form an opinion of < added him up at a glance>