Ignore

fall between the cracks

Meaning: be ignored or unobserved

Example: The management was so focused on planning for the next year's budget that they let this issue fall between the cracks. Read more ➺

turn a deaf ear

Meaning: choose not to hear

Example: Please do not just turn a deaf ear to their cries for help. Read more ➺

turn a blind eye

Meaning: deliberately overlook

Example: As a police officer, you cannot turn a blind eye to any of the illegal activities around you. Read more ➺