if something lowers the tone of a place, it makes it less suitable for people of a high social class, and if something lowers the tone of a conversation or a piece of writing, it makes it less polite or of a lower quality.

The locals don't like students living around here. It lowers the tone of the neighbourhood. (usually + of)

Trust you to lower the tone of the evening by telling rude jokes, Ian!

• throw a tantrum
• throw a temper tantrum
• throw away
• throw away something
• throw a wobbler
• throw a wobbly
• throw back in face
• throw back in someone's face
• throw caution to the wind
• throw caution to the winds
• throw cold water on
• throw cold water on something
• throw down the gauntlet
• throw for a loop
• throw good money after bad
• throw hat in the ring
• throw in
• throw in at the deep end
• throw in hand
• throw in lot with
• throw in lot with someone
• throw in something
• throw in the sponge
• throw in the towel
• throw into