Machines hummed, robots whirred.

Meaning: This means the machines and robots were making noises as they worked.

Choice of Words: Machines are devices with moving parts that transmit or modify energy or motion. Hummed means to make a low, continuous sound. Robots are machines that can be programmed to carry out a complex series of actions automatically. Whirred means to make a low, rapid, fluttering sound.

Alternative Expressions

Related Expressions

• Robots hummed, machines whirred.
• Machines hummed with contentment.
• The robot beeped and whirred as it worked.
• The washer whirred loudly, washing clothes.
• Drill whirred, soft buzzing filled air.
• The blender whirred loudly, mixing ingredients for a smoothie.
• Robots danced with mechanical grace.
• Its wheels whirred smoothly along floor.
• Sensors whirred, taking in the room.
• Robots fight aliens.