gesture, action, or sound that is used to convey information or instructions. Road-side lights that direct traffic to go or stop. To make a noise or motion to tell someone to start.

For a reason.

fleshy muscular organ in mouth of mammal. Specific manners of speaking. To use your mouth to touch something.

intellectual and practical activity encompassing systematic study of structure and behaviour of physical and natural world.

Denoting a chemical compound that has one sodium ion for every combining ion.

piece of thin wire with two short right-angled end pieces which are driven by stapler through sheets of paper to fasten them together. To pin together using a machine and bent wire.

organ or cell able to respond to light, heat, or other external stimulus. A nerve ending that changes stimuli into impulses.

engaging in speech. action of talking. To say things or ideas to someone with words.

causing surprise. To do something that another person didn't expect.

connected with something else. To spend time with other people; mix with.

Having a big effect on (person, the future).

of or for cooking.

have or hold within.

substance used to give different, stronger, or more agreeable taste to food or drink. To add extra taste to a food.

used to refer to thing, no matter what.