1. Plural of plughole; openings in a sink, bathtub, or basin through which water drains, typically fitted with a removable plug or stopper.
Usage: chiefly British English; commonly used in domestic contexts
2. Used figuratively to describe places or situations where money, resources, or effort disappears without producing results.
Usage: informal; metaphorical

Examples

• The bathroom sink has two plugholes, one for hot water and one for cold.
• Hair keeps clogging the plugholes in the shower.
• We need to clean out the plugholes before they get blocked.
• The old house's plugholes were made of brass and quite ornate.
• That project turned into a financial plughole, draining our budget with no return.
• Government spending on that program felt like pouring money down the plugholes.