# beware the Ides of March

idiom · CEFR C1

Source: https://englishreference.com/idiom/beware-the-ides-of-march
Updated: 2026-08-03

## Meaning

A warning that a specific day, or a trusted circle, holds danger.

## Examples

- The results come out on the fifteenth — beware the Ides of March.
- Every year the accountant tells his clients to beware the Ides of March, because that is when the first tax deadline falls.
- The columnist warned the prime minister to beware the Ides of March, noting that every serious challenge to her leadership had come not from the opposition benches but from the people sitting directly behind her.

## Origin

The Romans did not number the days of a month forward the way we do. They counted back from three fixed points, and the Ides was the middle one — the 15th in March, May, July and October, the 13th in every other month. On its own the Ides of March was just a date, and a cheerful one: a festival day. Plutarch records that a seer named Spurinna warned Caesar that danger would come to him no later than the Ides of March. On the day itself Caesar is said to have passed the man on his way to the Senate and remarked that the Ides had come; Spurinna answered that they had come, but not gone. Caesar was killed in that meeting, on 15 March 44 BC. Shakespeare compressed the whole exchange into three words — "Beware the ides of March" — and that is the form English kept. It now serves as a warning about a marked day, or about people close enough to be trusted and near enough to do harm.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.