Please place your glass ____ a coaster so as not to make a ring on the wooden table.

preposition

1. To a position on

   "We climbed onto the roof."

2. In or into a state of awareness about

   "put me onto your methods"

3. Used as a function word to indicate a set each element of which is the image of at least one element of another set

adjective

1. Mapping elements in such a way that every element in one set is the image of at least one element in another set

   "a function that is one-to-one and onto"

combining form

1. Being existence

   "ontology"

2. Organism

   "ontogeny"

idiom

1. Having done or discovered something important, special, etc.

   "When the crowd responded to the show so positively, we realized we were onto something."

phrasal verb

1. To add (a new room) to a structure that already exists

   "They built a new garage onto their house."

phrasal verb

1. To grip and tightly hold (something)

   "The stranger fastened onto my arm and wouldn't let go."

idiom

1. To start to do or deal with (something)

   ""We need someone to send out the invitations." "I'll get onto it right away.""

2. To start to talk about something

   "How did we get onto this topic?"

3. To speak to or write to (someone) about a particular problem, job, etc.

   "I'll get onto the doctor/plumber straightaway and see if he'll come round."

phrasal verb

1. To find or show the connections between two things or groups of things

   "map brain functions onto brain structures"

phrasal verb

1. To believe or imagine that (one's ideas, feelings, etc.) are shared by (another person)

   "She projected her fears onto him."

verb

1. Take, steal
2. Seize, catch