Verb
keep straight (third-person singular simple present keeps straight, present participle keeping straight, simple past and past participle kept straight)
(idiomatic) To avoid confusing or mixing up something; to keep something clear or organized.
Their names all sounded the same to me at first, and I had trouble keeping straight who was who.
There are fairies at the bottom of our garden! It's not so very, very far away; You pass the gardner's shed and you just keep straight ahead -- I do so hope they've really come to stay. Rose Fyleman