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etched in stone

Permanently fixed or firmly established; not subject to any amendment or alteration. Often used in the negative. The deal isn't yet etched in stone, but we're confident it will go ahead as hoped.
See also: etch, stone

etch (something) in(to) (something)

To cut something, such as a design or message, into some material or surface. Here, use this to try to etch your name into the glass.
See also: etch

be etched on (one's) heart

Said of something that one will always remember. The day you were born is just etched on my heart—I could never forget what it felt like to hold you for the first time.
See also: etch, heart, on

be etched on (one's) memory

Said of something that one will always remember. The day you were born is just etched on my memory—I could never forget what it felt like to hold you for the first time.
See also: etch, memory, on

be etched on (one's) mind

Said of something that one will always remember. The day you were born is just etched on my mind—I could never forget what it felt like to hold you for the first time.
See also: etch, mind, on

etch something in(to) something

 and etch something in
to erode a design or message into something, usually with acid. They etched their family crest into their good crystal. He etched in his initials.
See also: etch

cast in stone

Also, etched in stone. Definite, fixed, as in We may choose to stay longer-our plans aren't cast in stone, or When Carl sets an agenda you can safely assume it's etched in stone. Both expressions allude to sculpture, with the first, from the early 1500s, using the verb cast in the sense of pouring and hardening some material into a final form, and the second cutting or corroding a permanent design.
See also: cast, stone

be etched on your ˈheart/ˈmemory/ˈmind

be something that you will never forget because it affected you so strongly: The image of their son holding up the championship trophy would be etched on their memories forever.
See also: etch, heart, memory, mind, on
References in periodicals archive ?
They can not only etch straight down through material without drifting sideways, but also discriminate between silicon and silicon-oxide targets -- so one gets etched and not the other.
The 901e system was selected following an extensive evaluation of etched device wafers performed by the tool.
Similar etched patterns also remove the colored fringes often seen around images made by inexpensive lenses.
Trikon Technologies Inc (Nasdaq:TRKN), a technology leader in semiconductor processing equipment, today announced that one of its Omega(R) 201 M0RI(TM) high density plasma etch systems has successfully etched 0.
Chip designers can sculpt complicated layers of metal and semiconductor circuitry through repeated maskings with etched photoresists.
Elaborating on this, Hugh explains, "sandblasting requires machinery and has the disadvantage of showing fingerprints on the finished etched pattern.
The unique chamber design ensures that films on both sides of the wafer are simultaneously etched in the chemical dry etching environment, two wafers at a time in a single chambered system, and as many as four wafers at a time in a dual chambered system.
Lam pioneered single-wafer plasma etch tools in 1982 with its first product, the Lam AutoEtch(R) plasma etcher, which etched features of 1-2 microns in size.