May Day 
noun
11 May, celebrated in many countries as a traditional springtime festival or as an international day honouring workers.That was the spirit that inspired the establishment of May Day as international workers day....
- On May Day 1917, 70,000 workers marched here in support of the February Revolution in Russia.
- In the painting, Rivera included a scene of a giant May Day demonstration of workers marching with red banners.
1.1(In the UK) a public holiday on the first Monday in May.It's been a Bank Holiday here today - the annual public holiday for May Day....
- Speakers also called on the government to declare May Day a public holiday.
- Better times were back for North Yorkshire's battered tourist industry over the May Day Bank Holiday.
- Bornholm
- Bornholm disease
- born in (or out of) wedlock
- born in (or to) the purple
- bornite
- Born, Max
- born on the wrong side of the blanket
- boro-
- Borobudur
- soleplate
- sole proprietor
- solera
- solera system
- solera wine
- sole trader
- Soleure
- soleus
- soleus muscle
- sol-fa
- solfatara
- solfeggio
- solfège
- soli
- solicit
- solicitation