If someone or something is an 'odd man out' or an 'odd one out', it is unlike the others in a group.
When I got to the party everyone was wearing beautifully tailored suits and I was in ripped jeans and a smelly t-shirt. Felt like a bit of an odd man out.
Martha was always the odd one out. She never joined in when the other kids played.
An 'odd-job man' is a man paid to do many different kinds of jobs, often around the home.
I got Billy the odd-job man to fix my shelves and cut the grass in my garden. He did a great job so I recommended him to my neighbour.
This year's UK Cold Water Swimming Championships saw 600 swimmers brave the near-freezing waters at a lido in South London. There are a number of 'lidos', or outdoor swimming pools, in London and around the UK. The word comes from an Italian word meaning 'beach'.