El diccionario universal inglés-ruso

• It is intended for a full-text search and it significantly expands the possibilities of working with lexical items from the Russian glossary of LingvoUniversal. Contains usage examples, synonyms, and antonyms.

to be off one's base

амер.; разг.

1. быть не в своем уме

2. нелепо заблуждаться (about smth. - в чем-л.)