1, He never sticks to the point but keeps going off at a tangent.
2, One moment the professor is working hard on a problem in physics, the next he's gone off at a tangent and he's talking about bees.
3, The conversation went off at a tangent.
4, It's hard to get a firm decision out of him - he's always going off at a tangent.
5, Let's stay with the topic and not go off at a tangent.
6, Loretta's mind went off at a tangent.
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