off base

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• phrase not comparable, US Situated or happening outside the boundaries of a military base.
• phrase not comparable, baseball Positioned somewhere between the bases, and hence vulnerable to being caught out.
• phrase comparable, figuratively, of a person Mistaken; misguided; somewhat wrong in opinion or judgment.
• phrase comparable, figuratively, of an action, idea, etc Incorrect or inappropriate; not properly executed, envisioned, or understood.